| Abbreviation | Definition |
|---|---|
| RDU | Remote Dial Up |
| RDY | Ready |
| RDY/BSY | Ready/Busy |
| RDz | Rational Developer for System z |
| RDZ | Rational Developer for z |
| REA | Resources, Events, and Agents |
| REBE | Remote End Block Error |
| RED | Random Early Detection |
| REMSH | Remote SHell |
| RENT | Rental Empowerment Networking and Training |
| REPE | Recovery Enforcement Process Extension |
| REPL | Read Eval Print And Loop |
| REPL | Read Evaluate Print Loop |
| RES | Remote Execution Server |
| RESNET | Residential Energy Services Network |
| REST | Representational State Transfer |
| RETYPE | Retyping |
| RF | Relay Framework |
| RFB | Remote Frame Buffer |
| RFI | Router Fault Isolation |